01.The frequency of the induced emf in an induction motor is
Same as the supply frequency.
02.In an induction motor, the air gap flux density is usually kept low so as to
improve power factor
03.The frame of an induction motor is usually made of
Cast iron.
04.A wound rotor motor is mainly used in applications where
speed control is required.
05.When the supply frequency of a three phase induction motor is increased, then its synchronous speed is
increases.
06.In a double squirrel cage induction motor, the outer cage winding has
high resistance.
07.In induction motor, greater the number of poles
Lesser the speed.
08.The no-load speed of an induction motor depends upon
the number of its poles.
09.The operation of an induction motor is based on
Lenz's law.
10.At no load induction motor has possible power factor as
0.2.
11.A capacitor start single phase induction motor will usually have a power factor of
0.6 lagging.
12.Which part will surely tell that given motor is DC motor and not an AC type?
Commutator.
Explanation:- Commutator is used only in DC machine for providing mechanical rectification.
13.A resistance split-phase induction motor is used for
high inertia loads.
14.A capacitor-start, capacitor -run motor has
high power factor.
15.The washing machine generally employs
resistance split-phase motors.
16.universal motor and hysteresis motor is an a.c. motors and
synchronous type.
17.A reluctance motor runs at
synchronous speed.
18.In ac series motor the purpose of providing compensating winding is to
reduce sparking at brushes.
19.A d.c. series motor is accidentally connected to single phase supply. The torque produced will be
pulsating and unidirectional.
20.repulsion motor has the
largest starting torque.
Same as the supply frequency.
02.In an induction motor, the air gap flux density is usually kept low so as to
improve power factor
03.The frame of an induction motor is usually made of
Cast iron.
04.A wound rotor motor is mainly used in applications where
speed control is required.
05.When the supply frequency of a three phase induction motor is increased, then its synchronous speed is
increases.
06.In a double squirrel cage induction motor, the outer cage winding has
high resistance.
07.In induction motor, greater the number of poles
Lesser the speed.
08.The no-load speed of an induction motor depends upon
the number of its poles.
09.The operation of an induction motor is based on
Lenz's law.
10.At no load induction motor has possible power factor as
0.2.
11.A capacitor start single phase induction motor will usually have a power factor of
0.6 lagging.
12.Which part will surely tell that given motor is DC motor and not an AC type?
 |
Commutator.
Explanation:- Commutator is used only in DC machine for providing mechanical rectification.
13.A resistance split-phase induction motor is used for
high inertia loads.
14.A capacitor-start, capacitor -run motor has
high power factor.
15.The washing machine generally employs
resistance split-phase motors.
16.universal motor and hysteresis motor is an a.c. motors and
 |
| universal motor |
17.A reluctance motor runs at
synchronous speed.
18.In ac series motor the purpose of providing compensating winding is to
reduce sparking at brushes.
19.A d.c. series motor is accidentally connected to single phase supply. The torque produced will be
pulsating and unidirectional.
20.repulsion motor has the
largest starting torque.
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